package com.anghui.demo.utils;

import jakarta.servlet.http.HttpServletRequest;

public class IpUtils {
    public static String getClientIp() {
        HttpServletRequest request = ServletUtils.getRequest();
        if (request == null) {
            return null;
        }
        String ip = request.getHeader("X-Forwarded-For");

        if (ip == null || ip.isEmpty() || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.isEmpty() || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.isEmpty() || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_CLIENT_IP");
        }
        if (ip == null || ip.isEmpty() || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_X_FORWARDED_FOR");
        }
        if (ip == null || ip.isEmpty() || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }

        // 对于通过多个代理的情况，第一个IP才是真实IP
        if (ip != null && ip.contains(",")) {
            ip = ip.substring(0, ip.indexOf(","));
        }
        if ("0:0:0:0:0:0:0:1".equals(ip) || "::1".equals(ip)) {
            ip = "127.0.0.1";
        }
        return ip;
    }
}
